What does challenge mean to you
Explanation:
Measurement system, any of the systems used in the process of associating numbers with physical quantities and phenomena. Although the concept of weights and measures today includes such factors as temperature, luminosity, pressure, and electric current, it once consisted of only four basic measurements: mass (weight), distance or length, area, and volume (liquid or grain measure). The last three are, of course, closely related.
Well, that depends on what you ate that day.
True, because if you look at your feet all the time, you'll bump into someone.
Same thing for on the road.
